I do try to chub up a bit because I'm a grower not a show-er. I think it's just normal male behavior to want to be endowed when around other men. Like competition and showing your manhood around strangers. Something about it that I kinda get off on a little to be honest. Every once in a while I'll see a guy in the locker room work a full on woody. I'd definitely check them out. It's natural.